Friction: During a hockey game, a puck is given an initial speed of 10 m/s. It slides 50 m on the horizontal ice before it stops due to friction. What is the coefficient of kinetic friction between the puck and the ice?
A. 0.090
B. 0.10
C. 0.11
D. 0.12
Answer: B
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A 40-kg box is being pushed along a horizontal smooth surface. The pushing force is 15 N directed at an angle of 15° below the horizontal. What is the magnitude of the acceleration of the crate?
A) 0.16 m/s2 B) 0.36 m/s2 C) 0.47 m/s2 D) 0.39 m/s2 E) 0.68 m/s2
An atmosphere containing enough greenhouse gases can trap heat and raise the temperature of a planet's surface
Indicate whether the statement is true or false
What is the energy density in the magnetic field 25 cm from a long straight wire carrying a current of 12 A? (?0 = 4? × 10-7 T ? m/
A) A) 7.3 × 10-5 J/m3 B) 3.7 × 10-5 J/m3 C) 3.6 × 10-4 J/m3 D) 1.2 × 10-4 J/m3 E) The density cannot be determined without knowing the volume.
The ionic bond forms because the atoms involved
A) are naturally ions. B) have spherically symmetric charge distributions. C) are the same. D) all of the above E) none of the above